The Gilera SC is the same as a Derbi GPR ,right? This is how I change the time on my Derbi Tap the button until it goes to the clock then hold it in until it starts flashing. Tap to change the hour then leave it for a second and it will move over to the minutes and cycle through, just tap it to stop on the right time. The batteries are **** though so don't expect it to keep the time, you'll find yourself having to set it nearly every time you start your bike.